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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de3cd1ea97be1e37b042ef30802b274e6d86690cbad69f0a1267ca794afa8261' 
  AND token = 'K/3XNEUGTtc5UaR5UTnHDZykVnMsnyIZvb8u7gOFHlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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