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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '789ceead2d7b4a97b79574ab0b5e1dc4b98e6f3c8dfd7cbe147dfedd8b2fd7c2' 
  AND token = 'iQ49oO+txBhut05Z2BM/iYNp3vnb8wIaWCVaxhxVVrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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