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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf2c8a5151f509aafd92996bd5efd4216ac5f61fb19e8c2b2b9afa70124236ad' 
  AND token = 'Qjjc5Aj2gyBLDK2vxcSa/Ur6oCdv9m2vFkJvQi6pIPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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