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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd378d1d8bca8bfa4bc69520428e82883c834aeda8048737182c9d69e36539cf' 
  AND token = 'IJvIQdaLLaagpp/0R3IScst6cJ5eckIL4rBgEqEZEpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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