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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40127f7c2885e3e34cafb063c6ca2edddbb54acf3dd02f32a4c6569ff9510e17' 
  AND token = 'sdueu9pYxxuUI+QI3n2caSA6+6o8Unh/8db5y+E89ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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