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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de8b6ee850cdef629cbf59ade2ff6e0dcaebd22a2f7e0a96a483629554ee2fb9' 
  AND token = 'AZIspeBQM6nahZjULwheVyOZqLMqTy/o5T/Fm6+kkiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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