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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '23c06ac0a47ef951e2792af08529dea7c032f0d1d5bb46e802c625dd02d90d20' 
  AND token = 'h/fVMcBFfH5v6mtqNihpUMcOGXkL64LzDdHd0J4PY2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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