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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57ce162e8b315e0ce44e84f19e0fc1c6b072473b1b1e3a9ede2e4ed985bb7649' 
  AND token = 'JbUbTDSoQ4T9ZMy5lmlgCF4xQYZstCsxbzQRhJKQOrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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