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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b08fd2de965888e3cc67bf6321b4b1fdf56857a8ed87aca5ea6a907bac9362c0' 
  AND token = 'Nf9qXRfxNlsiW+gddczachdkDGxrnNWQ748Pl70DtTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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