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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3234a3625beeca1f316ce543a9228461134453ba535d5a62c41228662a84724' 
  AND token = 'fymD5iVyeBMmTrGoB1cfWqG4PFaaSs8l1HmZPuWDyh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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