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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6930a0b9b253ad6c4af044abc7adaf3a24b861ac56a6b83605a13f05cba365d2' 
  AND token = 'vJwZ5cVeb7L8FQ/yRLBfZg2l66jyQh7Aerdn4K7rKUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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