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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b197579c01618b5b220e427c9ffb23ecb22dbe10107caeaf25f9ba9a39ffab39' 
  AND token = 'mwuQUY7b9tasAjyDI/MMMW2UJt2IghnqIGh4i/MmIyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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