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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e96f9471b9908efbb094372670ba5273b04138879ac78105735ad12d7c0e50b0' 
  AND token = 'vXia8ylQiFjkCfp3rjDCtUu4embV1wtJNq4xwfEYe1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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