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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df02f32e45f239e0086134114e61f193b235106c88a16d62aabbd219c83a44f2' 
  AND token = '0J1ZM6FLo7Imfq1HHQwUxm0TCL17daGnsYSbDre/xZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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