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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33bdb0bd348bb1cef7cde9b0390af81649023dde924d424e16cfe1418abf9adb' 
  AND token = 'xH5APyp5T7ewK1ZHZWyMzV8nM7SdZlBm4frOizgGsOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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