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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37afb8a3d7e3087d702615d935219ff5707d26d1deb3b8c5b45ba2249b1f58fd' 
  AND token = 'WuBtck12f2jpJ0Tq/8MDJk5VkU9D27ob81tNTDi/V9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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