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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8af8c72a63ce5c20b64a6a5a15711278bce65f831c8421c95861f21e04e114f7' 
  AND token = 'kIWZ7Va8izMcrLO1YhuFniCYJrQXha2cpw1KAE4DDtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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