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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25c9bebc82163e957d76a44cec5d230029553256bfa37fee3cd7343610fc4123' 
  AND token = '1s+3uwEU9JbnxwwpnbfK7cF9UdywxsT60k9CHLBlrgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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