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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8abcda382b987c2641babf1a626e734e8ab2522013b16e4d81525eaf4b247172' 
  AND token = '57po7ItEnn3Cnv4jv8xegV0xU8o3cZm0Wth0StyBByc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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