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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55e1a87d49b66be951653147351ae66cba0a23ddf7d79cd33b0e13481551df11' 
  AND token = '6QSZsZ2Q8Vhh4idjAn1hntBCQxxBapXeE1jIP9LGO2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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