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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abd6daa876d5265aa027de7269d6648fccc0363dda55c91802147ef09aa4fb2f' 
  AND token = 'VlVfkbYm1RFiOB9s1kv3nLG0Ct6YEBCa5EnVRzUc5GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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