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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed4717f427bf7bf487d5c021580ee635a85c39f5b07678b7393af1519dfb9808' 
  AND token = 'kbHsoLBCwtnTTCtVZqcCVmekTwom0s/nJMoMd/eimwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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