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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '837fcd6240ae5fb723d3363f24d301846b430b86a2cb44075f202fab8fb4e853' 
  AND token = '/4C4BITlgmoWLWi14uloVzkx6vrxpOB1CPJ3u/W7MGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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