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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '876eb8b2d825497cf958881e705dacc6b0f1033051939a406799536ba7d7ac98' 
  AND token = 'sT6EGJZU+MrvhBGTXOkd+8y7vngoUkdIuZMmXTkfAT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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