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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9982f5a8478608ec5796087a8502d0d314789165c4bff8a7dc3c7009a358e73a' 
  AND token = 'vgdyB00HpDcCURqaFbQ0dI3AaqIPtHwiBbRiVKJHpA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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