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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac16f42d954d80ffb1577386fd697c528aad20682ba510217e4e7a2291158aa7' 
  AND token = 'yRcRn5LO0a40k6xljxsWjJhs96+8PPqKHNy/4q6Ltuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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