SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cba4303612b2a6b73d329090620cba8f8e57fb10fbc3bb51e2d86e9960453efb' 
  AND token = 'aWtUtOimQC+eBTjM9H8jgg5hKP4J0SRNf6hrJowKsmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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