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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9430847edcbb272ff573e2cbdcc2c34bcaab901b875925a9dc88186791cc526c' 
  AND token = 'JYOnUwSPNkrVnF25lbhQ1n6p5fZC79MzPDyGe9FvKro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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