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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ae801a706dda11f915de3ad486f129ad692799682e919670a69a099ddd4ece1' 
  AND token = 'Bd3JVXHtnupqQrqxZvWugial2wbVX1idlFDglnQ2kWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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