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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23368ef990b3b30f1b4008b4360217da6297da9035265901ca0f0fd67074ca6d' 
  AND token = 'NhXH3HgzrMJ75DGRqg39xzAEnJ16/1AjED7x4HNCbZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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