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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b141ca616d3c602482605c7a127751720d64134787bfd3865f4014a0ab820abb' 
  AND token = 'kpJvTCHTyaz0IjQkY0wHHkdl0zfazQfvQVievqRF/nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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