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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6f2689824201c3f33aa23b0c619843cf47c9182a1f1a1daf5259578b9cae2a8' 
  AND token = '9cdfJCGk6b7+l6t3hHkJnrxznZq7ZMMQSLyMQBNMphQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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