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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '21925321deaebeff335f928cb1c1ef5ed9342d6af6786fe71b0b7f025fcf369a' 
  AND token = '7BdOz1A5EOoZ/GJrcc9ngI3NYjUwYMfpVQjQbUyME6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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