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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c8eee524c2d1cb4796ed9651bf2e60cf2cb0bb0f0145fb9129f491e9f6e027b1' 
  AND token = 'bmeuVrCOQroG8uL92gEUk9Q6jCoZIZ/BxRM0FcOu3EE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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