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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e20e24c5ec765e74402705228f0963dbfc3bf005f0a8aabea428e92ae8c226c4' 
  AND token = 'EUkuXxOzdceEhYlJmwydnMjCDl6hf2g3QqY0tAGv1R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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