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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae42bbeabedb99de400e269a45926e6251eff248bd976fbbdda5ccffaf9bf6b9' 
  AND token = 'M5Qvg9ZOx2kSTstpAG4ruWCgBw0kcr5IEVJsJtKArpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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