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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa25d78041a34a56d1980734bce409389af2ece2396eb230a48510f1653a8ac7' 
  AND token = 'R235jUa1KIdzA3LO2HLs8rP2lY3fys6ODRcwSb/SAzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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