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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb4b497ace1c66ff878db5a32e3ce3cb4ef583f99517b05ab329cc26931040d' 
  AND token = '9/AH8Fi6EPacE+TTWou6aatJfwxmh/Ny/5Kos/iYfIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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