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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75f085966c6280cd9af3ce94248b7aae9fe515be8687eaa35feea6002d4f2821' 
  AND token = 'uMtTd5z8ozOyzHeShA1fVGyx2Z8wqCg5W3C0w9JGhAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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