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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd28332018253593f4bc93d2392f2cc7bba75294728c312019c22f15d7a680134' 
  AND token = 'KZLXnI6pFUPZAf7vHxv3cCynHjxtDeZWQMd8KfWj4cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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