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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe3ed5c9a6880fc86eb99155928e0223e900e7ea8e363d081d88bfeadc413ca' 
  AND token = 'vbNrLeyMHuRP41TO10BTM2atzpwd7FNSs7IQOIy+RYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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