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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1be8f48bdd83e8bc050070d7944c72192891435f06aa5daa769a261ab182f703' 
  AND token = 'PbtCseqwqZJjw3DkWdC4jw+ER69XmXrimrtFT4AX7dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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