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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bac2e5334cb117e6224bd834e5f7e1a112a7531e0cc5df4fba7f3f81eb35fc65' 
  AND token = 'YqnqVPCDAQg2daG8RmcQmHFrDQFgmzjn0WHlofnfmAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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