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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5595deda9c8e42b0d2a28b84e3ef9ab2c3f28c872de99b26cbfe592594dbe43f' 
  AND token = '1DfCgE7lODcN6YEnhgWhP7lIE+coYMhe64LjzqETe+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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