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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7d4a3e2730350a5b431969cbe83ac07d0b21d6dd9dabbe60c0338bc47908aa6' 
  AND token = 'wMZSMPEpYvhmctZA7ZSYrlor1sv3VxGpe+ll46C2mSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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