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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3a64764fa8158a1b615b32706e9b8dd4a39980628235ea9ad11a58d259b91bbe' 
  AND token = 'PNcuKnPq9NA7QNFPA0rEi4c512tXrciWZeoJLADH4Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}