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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c0eeacb5e8b013c912a9c17a062faa9fe7c68e7c9dd1b60a45ba040981a22bf' 
  AND token = 'gGRHSPxNfjocLYvqHQBiFAOWa1J9oc4q5hfAwt1P0ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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