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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '334de9401ed98a0609335320f50caf62d3c62150f24ecfa5e158be97e1ea228e' 
  AND token = 'S2UpWeawwvYIXQsVRX9AZiqezYUx/sHqpPIrtQvnWH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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