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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0706480494ba987718a0dcb4b1b301053b87bc6d768d5fe784659e498242ccfd' 
  AND token = 'Zo744QV/zz2N7ummoIxAkRcAcElX4aurIuAwr8p3UZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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