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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '767b6fe202c0cbca37924a7124873d2961e1fbe402519a62c2ca3cdaa61bf770' 
  AND token = 'vSuFR4ahkAyVLtFaXCALMlqGjy4lC0qPvICl4a6a8GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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