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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7a6f50293806c6261936f97f666004330c70bca33e35c94be61e438c20dfac3' 
  AND token = 'y3g4+EzrOnB7Q6KrdV3KjqxKArYpvBHb3804SI7xg/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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