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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '407723c8880ce2311eb77859a074bd135b4286017b1e3958a7aacac9df89a2b1' 
  AND token = 'lrfod8YenjcQlvebCoTX6kOJ0QE8MZ5r64ZbMj3py70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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